package com.ithema.reggie.controller;

import com.ithema.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${ruiji.path}")
    private  String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
   @PostMapping("/upload")
    public R<String> upload(MultipartFile file)  {

        //file 是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除

        log.info(file.toString());

       //原始文件名
       String orig=file.getOriginalFilename();
       String suffix = orig.substring(orig.lastIndexOf("."));

       //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
       String fileName = UUID.randomUUID().toString() + suffix;

       //创建一个目录对象
       File dir = new File(basePath);
       if (!dir.exists()){
           //目录不存在，需要创建
           dir.mkdirs();
       }
       try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
           return R.success(fileName);
    }
    @GetMapping("/download")
    private void download(String name, HttpServletResponse response){
       //输入流，读取文件内容
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));

            //输出流 把文件写回浏览器，在浏览器展示图片了
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len=0;
            byte[] bytes=new byte[1024];
            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
           e.printStackTrace();
        }



    }
}
